Isham Dam is an earth dam located in Sheridan County, Nebraska, built in 1953. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 26 ft26 ft tall and 502 ft long, taller than 55% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Isham Dam
The primary purpose of Isham Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by R Will Isham Cattle Company (private). It impounds the Tr-beaver Creek near Interior Sd.
The dam stands 26 feet tall and stretches 502 feet across, creates a reservoir covering 42 acres, has a maximum storage capacity of 619 acre-feet, and collects water from a drainage area of 11 square miles. Completed in 1953, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 04/20/2022.
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Location
| State | Nebraska |
| County | Sheridan |
| Nearest City | Interior Sd |
| River/Stream | Tr-beaver Creek |
| Coordinates | 42.91757, -102.78744 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 502 ft |
| Year Completed | 1953 (73 years old) |
Storage & Hydraulics
| NID Storage | 619 acre-ft |
| Max Storage | 619 acre-ft |
| Normal Storage | 435 acre-ft |
| Surface Area | 42 acres |
| Drainage Area | 11 sq mi |
| Max Discharge | 1,400 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | R Will Isham Cattle Company |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 04/20/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE00788 |
| Federal ID | NE00788 |
| More Info | State Dam Safety Program |